A: First things first; is the installation of the AHU a replacement or a completely new installation? If a replacement, it can be installed “like for like”. If a new installation, are the trusses capable of supporting the additional dead loads? An evaluation of the existing truss system by a registered design professional would be necessary. See FBC, Residential Code, Section R802.10. regarding engineered roof trusses.
A: Numerous sections of FBC Ch. 1, Scope and Administration are intentionally marked as “Reserved” to allow each jurisdiction to amend each such marked section as applicable for that particular jurisdiction.
A: A Corridor and an Exit Passageway are both defined terms:
CORRIDOR. An enclosed exit access component that defines and provides a path of egress travel.
EXIT PASSAGEWAY. An exit component that is separated from other interior spaces of a building or structure by fire resistance-rated construction and opening protectives, and provides for a protected path of egress travel in a horizontal direction to an exit or to the exit discharge.
While a corridor and an exit passageway are both components of the means of egress system, a corridor is not necessarily required to be of fire resistant rated construction while an exit passageway is, by definition, always rated. By definition, an exit passageway “provides a protected path of egress travel in a horizontal direction to an exit or to the exit discharge”.